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Contents of Significant Accounts - Summary of Stock Held by Associates (Detail) - shares
shares in Thousands
Dec. 31, 2023
Dec. 31, 2022
Disclosure Of Stock Held By Associates [Line Items]    
Number of shares in entity held by its subsidiaries or associates 900,961 634,334
HSUN CHIEH [member]    
Disclosure Of Stock Held By Associates [Line Items]    
Number of shares in entity held by its subsidiaries or associates 441,371 441,371
YANN YUAN [member]    
Disclosure Of Stock Held By Associates [Line Items]    
Number of shares in entity held by its subsidiaries or associates 192,963 192,963
SUBTRON, the subsidiary of UNIMICRON [member]    
Disclosure Of Stock Held By Associates [Line Items]    
Number of shares in entity held by its subsidiaries or associates [1] 47 0
SIS [member]    
Disclosure Of Stock Held By Associates [Line Items]    
Number of shares in entity held by its subsidiaries or associates [2] 266,580 0
[1] Beginning from January 2023, SUBTRON becomes an associate of the Company.
[2] Beginning from August 2023, SIS becomes an associate of the Company.